keychron_qmk_firmware/keyboards/geekboards/tester/tester.h

#pragma once
#include "quantum.h"
#define LAYOUT( \
      k00, k01, k02, k03,\
      k10, k11, k12, k13\
) \
{ \
    { k00, k01, k02, k03 }, \
    { k10, k11, k12, k13 } \
}